Re: [PATCH] loop: drop caches if offset or block_size are changed

[Jens Axboe]

On 1/9/19 8:17 PM, Jaegeuk Kim wrote:
> If we don't drop caches used in old offset or block_size, we can get old data
> from new offset/block_size, which gives unexpected data to user.
> 
> For example, Martijn found a loopback bug in the below scenario.
> 1) LOOP_SET_FD loads first two pages on loop file
> 2) LOOP_SET_STATUS64 changes the offset on the loop file
> 3) mount is failed due to the cached pages having wrong superblock

Applied, thanks.


-- 
Jens Axboe